CN104568031A - Implementation method of strong interference prevention of electromagnetic flowmeter - Google Patents
Implementation method of strong interference prevention of electromagnetic flowmeter Download PDFInfo
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- CN104568031A CN104568031A CN201410849004.7A CN201410849004A CN104568031A CN 104568031 A CN104568031 A CN 104568031A CN 201410849004 A CN201410849004 A CN 201410849004A CN 104568031 A CN104568031 A CN 104568031A
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- electromagnetic flowmeter
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Abstract
The invention provides an implementation method of strong interference prevention of an electromagnetic flowmeter. The electromagnetic flowmeter comprises at least two power sources, an external memory and a sensor; the two power sources are switched so that the signal of an exciter circuit can be stabilized; the external data memory is a ferroelectric memory; digital filtering processing is performed on the signals of the sensor to inhibit interference signals, and the excitation frequency is increased to increase the signal-to-noise ratio. According to the implementation method of strong interference prevention of the electromagnetic flowmeter, the operating efficiency of the electromagnetic flowmeter is improved, the interference intensity of power source noise to the signal circuit part is reduced, the signal-to-noise ratio of the original signal is increased, the sampling frequency is improved, the signal identification capability is enhanced and the zero point stability of high frequency excitation is also guaranteed.
Description
Technical field
The present invention relates to electricity field, particularly relate to a kind of electromagnetic flowmeter and resist strongly disturbing implementation method.
Background technology
At present, electromagnetic flowmeter applies maximum flow instruments as in flow instrument field, has been applied in numerous industrial field, especially goes up water/lower water, metallurgy/mine, papermaking/industry such as paper pulp and pharmacy.But these industries are in following situation at present: water resources in china maldistribution, perhaps fears are entertained that can affect sustainable development, therefore invests in water/lower water treatment numerous items, and infusion of financial resources is pre-in respect of 22,000,000,000 dollars; The side's strength developing into world market is attempted in mining industry; As the state plan being built into a complete industrial chain between afforestation and papermaking, fast-growing woods 5,000,000 hectares will be increased, build extensive modernization paper mill at afforestation areas adjacent; Existing more than 6700 pharmacy corporations of China, the OTC (over-the-counter) grown up rapidly in the Ye Shi world sells the pith of (OTC) drug market, and the upstream Iatrochemistry pharmaceutical industry be connected with it is combined and becomes medical big producing country.
But in the middle of the industry that these development potentialities are huge, the market share of domestic electromagnetic flowmeter is less, and its product mainly adopts import brand.The electromagnetic flowmeter of the measurement of high concentration paper pulp is needed as paper industry, the slurries adaptability of home products is more weak, in import brand, Japanese Yokogawa Motor adopts the electromagnetic flowmeter of dual-frequency excitation technology to preferably resolve this problem, and in China's paper industry, the market share is about 40%; For another example, in medicine, chemical industry, home products not yet solves the problems such as electromagnetic flowmeter high precision, high reliability, and market is mainly occupied by the foreign brand name such as Japanese Yokogawa, Cologne, Germany, ABB, E+H.
Summary of the invention
In view of this, the invention provides a kind of electromagnetic flowmeter and resist strongly disturbing implementation method, to solve the problem of domestic electromagnetic flowmeter in application places mid-early stage workshop sections such as papermaking, chemical industry, mines to can not the stablizing of coarse particles, Measurement accuracy.
Electromagnetic flowmeter provided by the invention resists strongly disturbing implementation method, and a kind of electromagnetic flowmeter resists strongly disturbing implementation method, and described electromagnetic flowmeter at least comprises: power supply, external memory storage and sensor,
Described power supply is two, makes the signal of field circuit reach steady state (SS) by Switching power,
Described external data memory adopts ferroelectric memory,
By digital filtering process, treatment and analysis is carried out to suppress undesired signal to sensor signal, and improve excitation frequency to improve signal to noise ratio (S/N ratio).
Further, use linear voltage regulator as constant current source and increase on power supply overvoltage, under-voltage protecting circuit with reduces converter energising and power-off time power supply to the impact of converter.
Further, described filtering process comprises: pectination bandpass filtering treatment and gray-scale filtering process.
Further, adopt Multi-layer PCB structure, increase spacing between each functional module to improve the antijamming capability between each functional module.
Further, exciting coil drive circuit is utilized to improve excitation frequency.
Further, described exciting coil drive circuit comprises: H bridge and switch driving circuit thereof, described H bridge high-end employing PNP Darlington transistor, and low side adopts N-channel MOS pipe.
Further, the signal power source in transformer and field power supply are separated to reduce the impact of field power supply on signal power source.
Further, single-chip microcomputer is adopted to carry out digital filtering process.
Beneficial effect of the present invention: the present invention makes electromagnetic flowmeter improve operational efficiency, introduce zona pectinata pass filtering technique and gray-scale filtering technology, later stage filtering process is carried out to signal, further reduction power supply noise is to the interference strength of signal circuit section, improve the signal to noise ratio (S/N ratio) of original signal, finally restore stable actual signal, adopt high frequency excitation and dual-frequency excitation technology, reach the object reducing slurries undesired signal; Improve sample frequency, strengthen the resolution characteristic of signal, also assures that the zero stability of high frequency excitation.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is exciter control system schematic diagram of the present invention.
Fig. 2 is comb band-pass filter amplitude-frequency response schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described: Fig. 1 is exciter control system schematic diagram of the present invention, and Fig. 2 is comb band-pass filter amplitude-frequency response schematic diagram of the present invention.
Described electromagnetic flowmeter at least comprises: power supply, external memory storage and sensor,
Described power supply is two, and the signal being field circuit by Switching power reaches steady state (SS),
Described external data memory adopts ferroelectric memory,
By digital filtering process, treatment and analysis is carried out to suppress undesired signal to sensor signal, and improve excitation frequency to improve signal to noise ratio (S/N ratio).
As shown in Figure 1, 2, the present embodiment comprises hardware optimization, signal transacting optimization and algorithm optimization;
Described hardware optimization comprises:
A1. by the switching to field circuit part height power supply, signal is made to reach steady state (SS) fast;
A2. external data memory is replaced with ferroelectric memory, to simplify circuit board;
A3. on power supply, add overvoltage, under-voltage protecting circuit, with reduce converter be energized and power-off time power supply to the impact of converter;
A4. adopt Multi-layer PCB structure, increase the spacing between each functional module, improve the antijamming capability between each functional module;
A5. linear voltage regulator is selected to build constant current source, to realize the rapid track and control of electric current.
Described signal transacting optimization comprises:
B1. adopt digital filtering technique, treatment and analysis is carried out to sensor signal, to suppress undesired signal,
B2. excitation frequency is improved, to improve signal to noise ratio (S/N ratio),
B3. the signal power source in transformer and field power supply are separated, to reduce the impact of field power supply on signal power source.
Described algorithm optimization comprises:
C1. single-chip microcomputer is used to carry out digital filtering process in step b1, to improve the antijamming capability of electromagnetic flowmeter.
In the present embodiment, excitation described in step b2 is frequently between 25Hz ~ 400Hz, adopt high frequency excitation and dual-frequency excitation technology to improve excitation frequency in step b2, described high frequency excitation and dual-frequency excitation technology utilize exciting coil drive circuit, ensure the zero stability of high frequency excitation.
In the present embodiment, described exciting coil drive circuit comprises: H bridge and switch driving circuit thereof, described H bridge high-end employing PNP Darlington transistor, and low side adopts N-channel MOS pipe, with continuous current circuit during bonding dual-frequency excitation, there is high impedance, and then ensure zero stability.
In the present embodiment, power supply adds overvoltage, under-voltage protection function, reduce converter be energized and power-off time power supply to the impact of converter, thus improve the reliability of converter.
In the present embodiment, on PCB fabric swatch, adopt four-sheet structure, the integrality between improve systematically, adds the spacing between each functional module, improves the antijamming capability between each functional module.For the problem that excitation Acquisition Circuit heat dissipation capacity is large, ohm sampling resistor of 1 is before risen to 10 ohm of sampling resistors.Thus simplify exciting current Acquisition Circuit, reduce the power consumption that power tube is shared, play reduce converter heat dissipation capacity more can, improve the reliability of converter.
In the present embodiment, the good linear voltage regulator of dynamic perfromance is selected to build constant current source to realize the rapid track and control of electric current,
In the present embodiment, because its conversion principle of stabilized voltage causes its dynamic perfromance poor, thus often cause its Control of Voltage lag output, cause electric current to export overshoot vibration, the characteristic that response speed is slower further.And consider the dissipation tolerance limit of circuit parameter, current response rate and linear voltage regulator to choose suitable supply voltage and linear voltage regulator.
In the present embodiment, high-performance electric magnetic flowmeter, by the significantly adjustment of compute mode, making data-handling efficiency improve 2 to 3 times, in order to improve the treatment effeciency of each functional module, the disposal route of each module all having done larger adjustment; Execution cycle is 0.4s; Signal processing consumes 0.12s, and other function consumption 0.04s, remaining 0.24s can be used to later stage filter design.In the present embodiment, eliminate original external data memory EEPROM, change ferroelectric memory into, board design is simplified, reduces costs.
In the present embodiment, excitation frequency is 25Hz, sample frequency is 4800Hz, gather excitation signal end 1/4 semiperiodic signal i.e. 24 signals to process, because excitation part needs to provide high pressure, but consider the reliability of mainboard and the size of coil inductance, analyze by experiment, the high pressure activation duration of the highest 4ms is selected in compromise, can ensure that the sensor signal of below DN400 bore can provide the stable state of 1/4 semiperiod like this.Converter completes function RS232 communication, and LCD shows, parameter modification, and data store, signal processing.Its excitation frequency is between 25Hz ~ 400Hz.Because slurries interference strength and excitation frequency are inverse ratio, therefore high frequency excitation can significantly reduce slurries interference signal intensity and improve signal to noise ratio (S/N ratio), and owing to being 4800Hz high-speed signal acquisition, improve flow velocity output speed, be conducive to the capability of fast response of fluid variation, carry out filtering process in conjunction with advanced Digital Signal Processing to the signal gathered, reach the stable object exported, wave filter amplitude-frequency response as shown in Figure 2.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. electromagnetic flowmeter resists a strongly disturbing implementation method, it is characterized in that: described electromagnetic flowmeter at least comprises: power supply, external memory storage and sensor,
Described power supply is two, makes the signal of field circuit reach steady state (SS) by Switching power,
Described external data memory adopts ferroelectric memory,
Digital filtering process is carried out to sensor signal and suppresses undesired signal, and improve excitation frequency to improve signal to noise ratio (S/N ratio).
2. electromagnetic flowmeter according to claim 1 resists strongly disturbing implementation method, it is characterized in that: use linear voltage regulator as constant current source and increase on power supply overvoltage, under-voltage protecting circuit with reduces converter energising and power-off time power supply to the impact of converter.
3. electromagnetic flowmeter according to claim 2 resists strongly disturbing implementation method, it is characterized in that: described filtering process comprises: pectination bandpass filtering treatment and gray-scale filtering process.
4. electromagnetic flowmeter according to claim 3 resists strongly disturbing implementation method, it is characterized in that: adopt Multi-layer PCB structure, increases spacing between each functional module to improve the antijamming capability between each functional module.
5. electromagnetic flowmeter according to claim 4 resists strongly disturbing implementation method, it is characterized in that: utilize exciting coil drive circuit to improve excitation frequency.
6. electromagnetic flowmeter according to claim 5 resists strongly disturbing implementation method, it is characterized in that: described exciting coil drive circuit comprises: H bridge and switch driving circuit thereof, described H bridge high-end employing PNP Darlington transistor, and low side adopts N-channel MOS pipe.
7. electromagnetic flowmeter according to claim 6 resists strongly disturbing implementation method, it is characterized in that: the signal power source in transformer and field power supply are separated to reduce the impact of field power supply on signal power source.
8. electromagnetic flowmeter according to claim 7 resists strongly disturbing implementation method, it is characterized in that: adopt single-chip microcomputer to carry out digital filtering process.
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| CN201410849004.7A CN104568031A (en) | 2014-12-31 | 2014-12-31 | Implementation method of strong interference prevention of electromagnetic flowmeter |
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| CN201410849004.7A CN104568031A (en) | 2014-12-31 | 2014-12-31 | Implementation method of strong interference prevention of electromagnetic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478279A (en) * | 2016-06-08 | 2017-12-15 | 西尼尔(南京)过程控制有限公司 | Electromagnetic flowmeter and its excitation voltage regulation method |
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| CN101893465A (en) * | 2010-06-30 | 2010-11-24 | 合肥工业大学 | DSP-based electromagnetic flowmeter signal processing system |
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2014
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| JP2000258211A (en) * | 1999-03-09 | 2000-09-22 | Yamatake Corp | Electromagnetic flowmeter |
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| CN101644591A (en) * | 2009-09-08 | 2010-02-10 | 合肥工业大学 | Mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply |
| CN101726334A (en) * | 2009-12-23 | 2010-06-09 | 合肥工业大学 | Electromagnetic flow meter excitation control system based on high and low voltage power switching |
| CN101893465A (en) * | 2010-06-30 | 2010-11-24 | 合肥工业大学 | DSP-based electromagnetic flowmeter signal processing system |
| CN102393225A (en) * | 2011-11-08 | 2012-03-28 | 合肥工业大学 | High/low voltage switching excitation system of electromagnetic flowmeter with bypass and energy feedback circuit |
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Cited By (1)
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| CN107478279A (en) * | 2016-06-08 | 2017-12-15 | 西尼尔(南京)过程控制有限公司 | Electromagnetic flowmeter and its excitation voltage regulation method |
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